Choosing Wisely:

Preset timed interval measurements of hemoglobin and hematocrit are no longer indicated as early detectors of instability. Clinical instability is defined by physiologic criteria such as age-specific tachycardia or hypotension, tachypnea, low urine output, altered mental status, or any significant clinical deterioration that warrants increased level of care and investigation. Therefore, the routine use of repeat laboratory studies in children with isolated solid organ injury who have physiologically normal vital signs for their age is not necessary.